Evaluation of Eye Fatigue for VDT Work Using Optical Response Analyzer

  • Miyauchi Hiroyuki
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health, Japan
  • Aoki Takamasa
    Organization for Health Suppor t and Promotion ofEnvironment and Safety, Kyushu Institute of Technology.

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  • 対光反応解析装置等を用いたVDT 作業に対する眼疲労の評価に関する研究

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<p>To objectively evaluate eye fatigue caused by working with visual display terminals (VDT), we examined the pupillary light reflex as a physiological index, using a pupillary light reflex analyzer. The study involved 25 participants (12 male and 13 female) aged between 21 and 23 years (mean 21.8 years). The participants performed a task using number-search task software; this simulated VDT work for 1 hour. Before and after performing the task, the participants filled a subjective symptom questionnaire and their pupillary light reflex was measured using a single light stimulation test. Eleven participants (four male and seven female; mean age, 21.7 years) also underwent ten consecutive light stimulation tests. Light stimulation to the eyes was provided using LED (red, 635 nm; blue, 470 nm) before and after the task. The difference in the pupillary light reflexes before and after the task was recorded. The subjective symptom survey revealed significantly more complaints of eye fatigue after the task than before the task (p<0.05). Results of the single light stimulation test showed that the rate of constriction (CR) in response to the blue LED after the task was significantly lower in both eyes than that before the task (p<0.05). The results of the ten consecutive light stimulation tests showed that the CR difference between the first and tenth stimulations using the blue LED was lower after the task than before the task, and a low CR persisted after the task. The above results showed that light reflex measurements may be indicative of eye fatigue, especially the CR, in response to the blue light stimulus. This test may be applied clinically to work management.</p>



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